1
|
Morgan AP, Payseur BA. Genetic background affects the strength of crossover interference in house mice. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.28.596233. [PMID: 38854148 PMCID: PMC11160618 DOI: 10.1101/2024.05.28.596233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Meiotic recombination is required for faithful chromosome segregation in most sexually reproducing organisms and shapes the distribution of genetic variation in populations. Both the overall rate and the spatial distribution of crossovers vary within and between species. Adjacent crossovers on the same chromosome tend to be spaced more evenly than expected at random, a phenomenon known as crossover interference. Although interference has been observed in many taxa, the factors that influence the strength of interference are not well understood. We used house mice (Mus musculus), a well-established model system for understanding recombination, to study the effects of genetics and age on recombination rate and interference in the male germline. We analyzed crossover positions in 503 progeny from reciprocal F1 hybrids between inbred strains representing the three major subspecies of house mice. Consistent with previous studies, autosomal alleles from M. m. musculus tend to increase recombination rate, while inheriting a M. m. musculus X chromosome decreases recombination rate. Old males transmit an average of 0.6 more crossovers per meiosis (5.0%) than young males, though the effect varies across genetic backgrounds. We show that the strength of crossover interference depends on genotype, providing a rare demonstration that interference evolves over short timescales. Differences between reciprocal F1s suggest that X-linked factors modulate the strength of interference. Our findings motivate additional comparisons of interference among recently diverged species and further examination of the role of paternal age in determining the number and positioning of crossovers.
Collapse
Affiliation(s)
- Andrew P Morgan
- Department of Medicine, University of North Carolina, Chapel Hill, NC
| | - Bret A Payseur
- Laboratory of Genetics, University of Wisconsin, Madison, WI
| |
Collapse
|
2
|
Kanippayoor RL, Soeder C, Hsiang T, Jones CD, Moehring AJ. Identification and genetic analysis of a pervasive 'needle-eye' sperm phenotype in Drosophila sterile hybrid males. Proc Biol Sci 2024; 291:20240483. [PMID: 38889778 DOI: 10.1098/rspb.2024.0483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/18/2024] [Indexed: 06/20/2024] Open
Abstract
Interspecies hybrid sterility has been extensively studied, especially in the genus Drosophila. Hybrid sterility is more often found in the heterogametic (XY or ZW) sex, a trend called Haldane's rule. Although this phenomenon is pervasive, identification of a common genetic mechanism remains elusive, with modest support found for a range of potential theories. Here, we identify a single precise morphological phenotype, which we call 'needle-eye sperm', that is associated with hybrid sterility in three separate species pairs that span the Drosophila genus. The nature of the phenotype indicates a common point of meiotic failure in sterile hybrid males. We used 10 generations of backcross selection paired with whole-genome pooled sequencing to genetically map the regions underlying the needle-eye (NE) sperm phenotype. Surprisingly, the sterility phenotype was present in ~50% of males even after 10 generations of backcrossing, and only a single region of the X chromosome was associated with sterility in one direction of backcross. Owing to the common phenotype among sterile male hybrids, and the strong effect of individual loci, further exploration of these findings may identify a universal mechanism for the evolution of hybrid sterility.
Collapse
Affiliation(s)
| | - Charles Soeder
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Tom Hsiang
- School of Environmental Sciences, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Corbin D Jones
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Amanda J Moehring
- Department of Biology, Western University, London, Ontario N6A 5B7, Canada
| |
Collapse
|
3
|
Yang Q, Xie Y, Pan B, Cheng Y, Zhu Y, Fei X, Li X, Yu J, Chen Z, Li J, Xiong X. The Expression and Epigenetic Characteristics of the HSF2 Gene in Cattle-Yak and the Correlation with Its Male Sterility. Animals (Basel) 2024; 14:1410. [PMID: 38791628 PMCID: PMC11117389 DOI: 10.3390/ani14101410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 04/29/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
Aberrant expression of the heat shock proteins and factors was revealed to be closely associated with male reproduction. Heat shock factor 2 (HSF2) is a transcription factor that is involved in the regulation of diverse developmental pathways. However, the role and the corresponding molecular mechanism of HSF2 in male cattle-yak sterility are still poorly understood. Therefore, the aim of this study was to obtain the sequence and the biological information of the cattle-yak HSF2 gene and to investigate the spatiotemporal expression profiles of the locus during the development of cattle-yak testes. Additionally, the differential expression was analyzed between the cattle-yak and the yak, and the methylation of corresponding promoter regions was compared. Our results showed an additional 54 bp fragment and a missense mutation (lysine to glutamic acid) were presented in the cattle-yak HSF2 gene, which correlated with enriched expression in testicular tissue. In addition, the expression of the HSF2 gene showed dynamic changes during the growth of the testes, reaching a peak in adulthood. The IHC indicated that HSF2 protein was primarily located in spermatocytes (PS), spermatogonia (SP), and Sertoli cells (SC) in cattle-yak testes, compared with the corresponding cells of cattle and the yak. Furthermore, bisulfite-sequencing PCR (BSP) revealed that the methylated CpG sites in the promoter region of the cattle-yak HSF2 were more numerous than in the yak counterpart, which suggests hypermethylation of this region in the cattle-yak. Taken together, the low expression abundance and hypermethylation of HSF2 may underpin the obstruction of spermatogenesis, which leads to male cattle-yak infertility. Our study provided a basic guideline for the HSF2 gene in male reproduction and a new insight into the mechanisms of male cattle-yak sterility.
Collapse
Affiliation(s)
- Qinhui Yang
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| | - Yumian Xie
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
| | - Bangting Pan
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| | - Yuying Cheng
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
| | - Yanjin Zhu
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
| | - Xixi Fei
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| | - Xupeng Li
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
| | - Jun Yu
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| | - Zhuo Chen
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
| | - Jian Li
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| | - Xianrong Xiong
- Key Laboratory for Animal Science of National Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China; (Q.Y.); (Y.X.); (Y.C.); (Y.Z.); (X.L.); (Z.C.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation of Ministry of Education, Southwest Minzu University, Chengdu 610041, China; (B.P.); (X.F.); (J.Y.)
| |
Collapse
|
4
|
Chi J, Ye J, Zhou Y. Mapping QTL controlling count traits with excess zeros and ones using a zero-and-one-inflated generalized Poisson regression model. Biom J 2024; 66:e2200342. [PMID: 38616336 DOI: 10.1002/bimj.202200342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 11/26/2023] [Accepted: 12/08/2023] [Indexed: 04/16/2024]
Abstract
The research on the quantitative trait locus (QTL) mapping of count data has aroused the wide attention of researchers. There are frequent problems in applied research that limit the application of the conventional Poisson model in the analysis of count phenotypes, which include the overdispersion and excess zeros and ones. In this article, a novel model, that is, the zero-and-one-inflated generalized Poisson (ZOIGP) model, is proposed to deal with these problems. Based on the proposed model, a score test is performed for the inflation parameter, in which the ZOIGP model with a constant proportion of excess zeros and ones is compared with a standard generalized Poisson model. To illustrate the practicability of the ZOIGP model, we extend it to the QTL interval mapping application that underpins count phenotype with excess zeros and excess ones. The genetic effects are estimated utilizing the expectation-maximization algorithm embedded with the Newton-Raphson algorithm, and the genome-wide scan and likelihood ratio test is performed to map and test the potential QTLs. The statistical properties exhibited by the proposed method are investigated through simulation. Finally, a real data analysis example is used to illustrate the utility of the proposed method for QTL mapping.
Collapse
Affiliation(s)
- Jinling Chi
- School of Mathematics and Statistics, Xidian University, Xi'an, China
| | - Jimin Ye
- School of Mathematics and Statistics, Xidian University, Xi'an, China
| | - Ying Zhou
- School of Mathematical Sciences, Heilongjiang University, Harbin, China
| |
Collapse
|
5
|
Dumont BL, Gatti DM, Ballinger MA, Lin D, Phifer-Rixey M, Sheehan MJ, Suzuki TA, Wooldridge LK, Frempong HO, Lawal RA, Churchill GA, Lutz C, Rosenthal N, White JK, Nachman MW. Into the Wild: A novel wild-derived inbred strain resource expands the genomic and phenotypic diversity of laboratory mouse models. PLoS Genet 2024; 20:e1011228. [PMID: 38598567 PMCID: PMC11034653 DOI: 10.1371/journal.pgen.1011228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 04/22/2024] [Accepted: 03/18/2024] [Indexed: 04/12/2024] Open
Abstract
The laboratory mouse has served as the premier animal model system for both basic and preclinical investigations for over a century. However, laboratory mice capture only a subset of the genetic variation found in wild mouse populations, ultimately limiting the potential of classical inbred strains to uncover phenotype-associated variants and pathways. Wild mouse populations are reservoirs of genetic diversity that could facilitate the discovery of new functional and disease-associated alleles, but the scarcity of commercially available, well-characterized wild mouse strains limits their broader adoption in biomedical research. To overcome this barrier, we have recently developed, sequenced, and phenotyped a set of 11 inbred strains derived from wild-caught Mus musculus domesticus. Each of these "Nachman strains" immortalizes a unique wild haplotype sampled from one of five environmentally distinct locations across North and South America. Whole genome sequence analysis reveals that each strain carries between 4.73-6.54 million single nucleotide differences relative to the GRCm39 mouse reference, with 42.5% of variants in the Nachman strain genomes absent from current classical inbred mouse strain panels. We phenotyped the Nachman strains on a customized pipeline to assess the scope of disease-relevant neurobehavioral, biochemical, physiological, metabolic, and morphological trait variation. The Nachman strains exhibit significant inter-strain variation in >90% of 1119 surveyed traits and expand the range of phenotypic diversity captured in classical inbred strain panels. These novel wild-derived inbred mouse strain resources are set to empower new discoveries in both basic and preclinical research.
Collapse
Affiliation(s)
- Beth L. Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Daniel M. Gatti
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Mallory A. Ballinger
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, United States of America
| | - Dana Lin
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Megan Phifer-Rixey
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, United States of America
| | - Michael J. Sheehan
- Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, United States of America
| | - Taichi A. Suzuki
- College of Health Solutions and Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, Arizona, United States of America
| | - Lydia K. Wooldridge
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Hilda Opoku Frempong
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Raman Akinyanju Lawal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Gary A. Churchill
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Cathleen Lutz
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Nadia Rosenthal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Jacqueline K. White
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Michael W. Nachman
- Department of Integrative Biology, Museum of Vertebrate Zoology, and Center for Computational Biology, University of California, Berkeley, Berkeley, California, United States of America
| |
Collapse
|
6
|
Dumont BL, Gatti D, Ballinger MA, Lin D, Phifer-Rixey M, Sheehan MJ, Suzuki TA, Wooldridge LK, Frempong HO, Churchill G, Lutz C, Rosenthal N, White JK, Nachman MW. Into the Wild: A novel wild-derived inbred strain resource expands the genomic and phenotypic diversity of laboratory mouse models. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.21.558738. [PMID: 37790321 PMCID: PMC10542534 DOI: 10.1101/2023.09.21.558738] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
The laboratory mouse has served as the premier animal model system for both basic and preclinical investigations for a century. However, laboratory mice capture a narrow subset of the genetic variation found in wild mouse populations. This consideration inherently restricts the scope of potential discovery in laboratory models and narrows the pool of potentially identified phenotype-associated variants and pathways. Wild mouse populations are reservoirs of predicted functional and disease-associated alleles, but the sparsity of commercially available, well-characterized wild mouse strains limits their broader adoption in biomedical research. To overcome this barrier, we have recently imported, sequenced, and phenotyped a set of 11 wild-derived inbred strains developed from wild-caught Mus musculus domesticus. Each of these "Nachman strains" immortalizes a unique wild haplotype sampled from five environmentally diverse locations across North and South America: Saratoga Springs, New York, USA; Gainesville, Florida, USA; Manaus, Brazil; Tucson, Arizona, USA; and Edmonton, Alberta, Canada. Whole genome sequence analysis reveals that each strain carries between 4.73-6.54 million single nucleotide differences relative to the mouse reference assembly, with 42.5% of variants in the Nachman strain genomes absent from classical inbred mouse strains. We phenotyped the Nachman strains on a customized pipeline to assess the scope of disease-relevant neurobehavioral, biochemical, physiological, metabolic, and morphological trait variation. The Nachman strains exhibit significant inter-strain variation in >90% of 1119 surveyed traits and expand the range of phenotypic diversity captured in classical inbred strain panels alone. Taken together, our work introduces a novel wild-derived inbred mouse strain resource that will enable new discoveries in basic and preclinical research. These strains are currently available through The Jackson Laboratory Repository under laboratory code NachJ.
Collapse
Affiliation(s)
- Beth L Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Daniel Gatti
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
| | - Mallory A Ballinger
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Dana Lin
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
| | | | - Michael J Sheehan
- Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
| | - Taichi A Suzuki
- College of Health Solutions and Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, USA 85281
| | | | - Hilda Opoku Frempong
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Gary Churchill
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Cathleen Lutz
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
| | - Nadia Rosenthal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | | | - Michael W Nachman
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
| |
Collapse
|
7
|
Garretson A, Dumont BL, Handel MA. Reproductive genomics of the mouse: implications for human fertility and infertility. Development 2023; 150:dev201313. [PMID: 36779988 PMCID: PMC10836652 DOI: 10.1242/dev.201313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Genetic analyses of mammalian gametogenesis and fertility have the potential to inform about two important and interrelated clinical areas: infertility and contraception. Here, we address the genetics and genomics underlying gamete formation, productivity and function in the context of reproductive success in mammalian systems, primarily mouse and human. Although much is known about the specific genes and proteins required for meiotic processes and sperm function, we know relatively little about other gametic determinants of overall fertility, such as regulation of gamete numbers, duration of gamete production, and gamete selection and function in fertilization. As fertility is not a binary trait, attention is now appropriately focused on the oligogenic, quantitative aspects of reproduction. Multiparent mouse populations, created by complex crossing strategies, exhibit genetic diversity similar to human populations and will be valuable resources for genetic discovery, helping to overcome current limitations to our knowledge of mammalian reproductive genetics. Finally, we discuss how what we know about the genomics of reproduction can ultimately be brought to the clinic, informing our concepts of human fertility and infertility, and improving assisted reproductive technologies.
Collapse
Affiliation(s)
- Alexis Garretson
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA 02111, USA
| | - Beth L. Dumont
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA 02111, USA
| | - Mary Ann Handel
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA 02111, USA
| |
Collapse
|
8
|
Valiskova B, Gregorova S, Lustyk D, Šimeček P, Jansa P, Forejt J. Genic and Chromosomal Components of Prdm9-Driven Hybrid Male Sterility in Mice (Mus musculus). Genetics 2022; 222:6655690. [PMID: 35924978 PMCID: PMC9434306 DOI: 10.1093/genetics/iyac116] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 07/27/2022] [Indexed: 11/14/2022] Open
Abstract
Hybrid sterility contributes to speciation by preventing gene flow between related taxa. Prdm9, the first and only hybrid male sterility (HMS) gene known in vertebrates, predetermines the sites of recombination between homologous chromosomes and their synapsis in early meiotic prophase. The asymmetric binding of PRDM9 to heterosubspecific homologs of Mus m. musculus x Mus m. domesticus F1 hybrids and increase of PRDM9-independent DNA double-strand break (DSB) hotspots results in difficult to repair DSBs, incomplete synapsis of homologous chromosomes and meiotic arrest at the first meiotic prophase. Here we show that Prdm9 behaves as a major HMS gene in mice outside the Mus m. musculus x Mus m. domesticus F1 hybrids, in the genomes composed of Mus m. castaneus and Mus m. musculus chromosomes segregating on the Mus m. domesticus background. The Prdm9cst/dom2 (castaneus/domesticus) allelic combination secures meiotic synapsis, testes weight and sperm count within physiological limits, while the Prdm9msc1/dom2 (musculus/domesticus) males show a range of fertility impairment. Out of five quantitative trait loci contributing to the Prdm9msc1/dom2-related infertility, four control either meiotic synapsis or fertility phenotypes and one controls both, synapsis and fertility. Whole-genome genotyping of individual chromosomes showed preferential involvement of nonrecombinant musculus chromosomes in asynapsis in accordance with the chromosomal character of HMS. Moreover, we show that the overall asynapsis rate can be estimated solely from the genotype of individual males by scoring the effect of nonrecombinant musculus chromosomes. Prdm9-controlled HMS represents an example of genetic architecture of HMS consisting of genic and chromosomal components.
Collapse
Affiliation(s)
- Barbora Valiskova
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| | - Sona Gregorova
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| | - Diana Lustyk
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| | - Petr Šimeček
- Central Laboratory of Bioinformatics, CEITEC—Central European Institute of Technology, Masaryk University, Brno 625 00, Czech Republic
| | - Petr Jansa
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| | - Jiří Forejt
- Corresponding author: Laboratory of Mouse Molecular Genetics, Division BIOCEV, Institute of Molecular Genetics, Czech Academy of Sciences, Průmyslová 595, Vestec 25250, Czech Republic.
| |
Collapse
|
9
|
A microscopy investigation of the complex problem of infertility of insect hybrids. Studies on the reproductive systems, eggshells, and karyotypes of the representatives of the genus Platymeris (Heteroptera, Reduviidae) and their hybrids. Micron 2022; 158:103248. [DOI: 10.1016/j.micron.2022.103248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 03/21/2022] [Accepted: 03/22/2022] [Indexed: 01/08/2023]
|
10
|
Larson EL, Kopania EEK, Hunnicutt KE, Vanderpool D, Keeble S, Good JM. Stage-specific disruption of X chromosome expression during spermatogenesis in sterile house mouse hybrids. G3 (BETHESDA, MD.) 2022; 12:jkab407. [PMID: 34864964 PMCID: PMC9210296 DOI: 10.1093/g3journal/jkab407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 11/16/2021] [Indexed: 01/09/2023]
Abstract
Hybrid sterility is a complex phenotype that can result from the breakdown of spermatogenesis at multiple developmental stages. Here, we disentangle two proposed hybrid male sterility mechanisms in the house mice, Mus musculus domesticus and M. m. musculus, by comparing patterns of gene expression in sterile F1 hybrids from a reciprocal cross. We found that hybrid males from both cross directions showed disrupted X chromosome expression during prophase of meiosis I consistent with a loss of meiotic sex chromosome inactivation (MSCI) and Prdm9-associated sterility, but that the degree of disruption was greater in mice with an M. m. musculus X chromosome consistent with previous studies. During postmeiotic development, gene expression on the X chromosome was only disrupted in one cross direction, suggesting that misexpression at this later stage was genotype-specific and not a simple downstream consequence of MSCI disruption which was observed in both reciprocal crosses. Instead, disrupted postmeiotic expression may depend on the magnitude of earlier disrupted MSCI, or the disruption of particular X-linked genes or gene networks. Alternatively, only hybrids with a potential deficit of Sly copies, a Y-linked ampliconic gene family, showed overexpression in postmeiotic cells, consistent with a previously proposed model of antagonistic coevolution between the X- and Y-linked ampliconic genes contributing to disrupted expression late in spermatogenesis. The relative contributions of these two regulatory mechanisms and their impact on sterility phenotypes await further study. Our results further support the hypothesis that X-linked hybrid sterility in house mice has a variable genetic basis, and that genotype-specific disruption of gene regulation contributes to overexpression of the X chromosome at different stages of development. Overall, these findings underscore the critical role of epigenetic regulation of the X chromosome during spermatogenesis and suggest that these processes are prone to disruption in hybrids.
Collapse
Affiliation(s)
- Erica L Larson
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
| | - Emily E K Kopania
- Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA
| | - Kelsie E Hunnicutt
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
| | - Dan Vanderpool
- Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA
| | - Sara Keeble
- Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA
| | - Jeffrey M Good
- Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA
| |
Collapse
|
11
|
Hunnicutt KE, Good JM, Larson EL. Unraveling patterns of disrupted gene expression across a complex tissue. Evolution 2022; 76:275-291. [PMID: 34882778 PMCID: PMC9355168 DOI: 10.1111/evo.14420] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 11/11/2021] [Accepted: 11/26/2021] [Indexed: 02/03/2023]
Abstract
Whole tissue RNASeq is the standard approach for studying gene expression divergence in evolutionary biology and provides a snapshot of the comprehensive transcriptome for a given tissue. However, whole tissues consist of diverse cell types differing in expression profiles, and the cellular composition of these tissues can evolve across species. Here, we investigate the effects of different cellular composition on whole tissue expression profiles. We compared gene expression from whole testes and enriched spermatogenesis populations in two species of house mice, Mus musculus musculus and M. m. domesticus, and their sterile and fertile F1 hybrids, which differ in both cellular composition and regulatory dynamics. We found that cellular composition differences skewed expression profiles and differential gene expression in whole testes samples. Importantly, both approaches were able to detect large-scale patterns such as disrupted X chromosome expression, although whole testes sampling resulted in decreased power to detect differentially expressed genes. We encourage researchers to account for histology in RNASeq and consider methods that reduce sample complexity whenever feasible. Ultimately, we show that differences in cellular composition between tissues can modify expression profiles, potentially altering inferred gene ontological processes, insights into gene network evolution, and processes governing gene expression evolution.
Collapse
Affiliation(s)
- Kelsie E Hunnicutt
- Department of Biological Sciences, University of Denver, Denver, Colorado, 80208
| | - Jeffrey M Good
- Division of Biological Sciences, University of Montana, Missoula, Montana, 59812
| | - Erica L Larson
- Department of Biological Sciences, University of Denver, Denver, Colorado, 80208
| |
Collapse
|
12
|
Bredemeyer KR, Seabury CM, Stickney MJ, McCarrey JR, vonHoldt BM, Murphy WJ. Rapid Macrosatellite Evolution Promotes X-Linked Hybrid Male Sterility in a Feline Interspecies Cross. Mol Biol Evol 2021; 38:5588-5609. [PMID: 34519828 PMCID: PMC8662614 DOI: 10.1093/molbev/msab274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The sterility or inviability of hybrid offspring produced from an interspecific mating result from incompatibilities between parental genotypes that are thought to result from divergence of loci involved in epistatic interactions. However, attributes contributing to the rapid evolution of these regions also complicates their assembly, thus discovery of candidate hybrid sterility loci is difficult and has been restricted to a small number of model systems. Here we reported rapid interspecific divergence at the DXZ4 macrosatellite locus in an interspecific cross between two closely related mammalian species: the domestic cat (Felis silvestris catus) and the Jungle cat (Felis chaus). DXZ4 is an interesting candidate due to its structural complexity, copy number variability, and described role in the critical yet complex biological process of X-chromosome inactivation. However, the full structure of DXZ4 was absent or incomplete in nearly every available mammalian genome assembly given its repetitive complexity. We compared highly continuous genomes for three cat species, each containing a complete DXZ4 locus, and discovered that the felid DXZ4 locus differs substantially from the human ortholog, and that it varies in copy number between cat species. Additionally, we reported expression, methylation, and structural conformation profiles of DXZ4 and the X chromosome during stages of spermatogenesis that have been previously associated with hybrid male sterility. Collectively, these findings suggest a new role for DXZ4 in male meiosis and a mechanism for feline interspecific incompatibility through rapid satellite divergence.
Collapse
Affiliation(s)
- Kevin R Bredemeyer
- Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, TX, USA
| | | | - Mark J Stickney
- Veterinary Medical Teaching Hospital, Texas A&M University, College Station, TX, USA
| | - John R McCarrey
- Department of Biology, University of Texas at San Antonio, San Antonio, TX, USA
| | | | - William J Murphy
- Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, TX, USA
| |
Collapse
|
13
|
Forejt J, Jansa P, Parvanov E. Hybrid sterility genes in mice (Mus musculus): a peculiar case of PRDM9 incompatibility. Trends Genet 2021; 37:1095-1108. [PMID: 34238593 DOI: 10.1016/j.tig.2021.06.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/08/2021] [Accepted: 06/10/2021] [Indexed: 12/14/2022]
Abstract
Hybrid sterility is a critical step in the evolution of reproductive barriers between diverging taxa during the process of speciation. Recent studies of young subspecies of the house mouse revealed a multigenic nature and frequent polymorphism of hybrid sterility genes as well as the recurrent engagement of the meiosis-specific gene PR domain-containing 9 (Prdm9) and X-linked loci. Prdm9-controlled hybrid sterility is essentially chromosomal in nature, conditioned by the sequence divergence between subspecies. Depending on the Prdm9 interallelic interactions and the X-linked Hstx2 locus, the same homologs either regularly recombine and synapse, or show impaired DNA DSB repair, asynapsis, and early meiotic arrest. Thus, Prdm9-dependent hybrid sterility points to incompatibilities affecting meiotic recombination as a possible mechanism of reproductive isolation between (sub)species.
Collapse
Affiliation(s)
- Jiri Forejt
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic.
| | - Petr Jansa
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| | - Emil Parvanov
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec 252 50, Czech Republic
| |
Collapse
|
14
|
Robert N, Yan C, Si-Jiu Y, Bo L, He H, Pengfei Z, Hongwei X, Jian Z, Shijie L, Qian Z. Expression of Rad51 and the histo-morphological evaluation of testis of the sterile male cattle-yak. Theriogenology 2021; 172:239-254. [PMID: 34298284 DOI: 10.1016/j.theriogenology.2021.06.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 06/28/2021] [Accepted: 06/29/2021] [Indexed: 11/18/2022]
Abstract
Meiotic recombination is key to the repair of DNA double-strand break damage, provide a link between homologs for proper chromosome segregation as well as ensure genetic diversity in organisms. Defects in recombination often lead to sterility. The ubiquitously expressed Rad51 and the meiosis-specific DMC1 are two closely related recombinases that catalyze the key strand invasion and exchange step of meiotic recombination. This study cloned and sequenced the coding region of cattle-yak Rad51 and determined its mRNA and protein expression levels, evaluated its molecular and evolutionary relationship as well as evaluated the histo-morphological structure of testes in the yellow cattle, yak and the sterile cattle-yak hybrid. The Rad51 gene was amplified using PCR, cloned and sequenced using testicular cDNA from yak and cattle-yak. Real-time PCR was used to examine the expression levels of Rad51/DMC1 mRNA in the cattle, yak and cattle-yak testis while western blotting, immunofluorescence and immunohistochemistry were used to assess the protein expression and localization of Rad51/DMC1 protein in the testicular tissue sections. The results revealed that the mRNA and protein expression of Rad51 and DMC1 are extremely low in the male cattle-yak testis with a corresponding higher incidence of germ cell apoptosis. There was also thinning of the germinal epithelium possibly due to the depletion of the germ cells leading to the widening of the lumen area of the cattle-yak seminiferous tubule. Our findings provide support for the hypothesis that the low expression of Rad51 and DMC1 may contribute to the male hybrid sterility in the cattle-yak.
Collapse
Affiliation(s)
- Niayale Robert
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Cui Yan
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China; Gansu Province Livestock Embryo Engineering Research Center, Department of Clinical Veterinary Medicine, Faculty of Veterinary Medicine Gansu Agricultural University, Lanzhou, China.
| | - Yu Si-Jiu
- Gansu Province Livestock Embryo Engineering Research Center, Department of Clinical Veterinary Medicine, Faculty of Veterinary Medicine Gansu Agricultural University, Lanzhou, China
| | - Liao Bo
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Honghong He
- Gansu Province Livestock Embryo Engineering Research Center, Department of Clinical Veterinary Medicine, Faculty of Veterinary Medicine Gansu Agricultural University, Lanzhou, China
| | - Zhao Pengfei
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Xu Hongwei
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Zhang Jian
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Li Shijie
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Zhang Qian
- Laboratory of Animal Anatomy & Tissue Embryology, Department of Basic Veterinary Medicine, Faculty of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| |
Collapse
|
15
|
Morgan K, Harr B, White MA, Payseur BA, Turner LM. Disrupted Gene Networks in Subfertile Hybrid House Mice. Mol Biol Evol 2021; 37:1547-1562. [PMID: 32076722 PMCID: PMC7253214 DOI: 10.1093/molbev/msaa002] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The Dobzhansky–Muller (DM) model provides a widely accepted mechanism for the evolution of reproductive isolation: incompatible substitutions disrupt interactions between genes. To date, few candidate incompatibility genes have been identified, leaving the genes driving speciation mostly uncharacterized. The importance of interactions in the DM model suggests that gene coexpression networks provide a powerful framework to understand disrupted pathways associated with postzygotic isolation. Here, we perform weighted gene coexpression network analysis to infer gene interactions in hybrids of two recently diverged European house mouse subspecies, Mus mus domesticus and M. m. musculus, which commonly show hybrid male sterility or subfertility. We use genome-wide testis expression data from 467 hybrid mice from two mapping populations: F2s from a laboratory cross between wild-derived pure subspecies strains and offspring of natural hybrids captured in the Central Europe hybrid zone. This large data set enabled us to build a robust consensus network using hybrid males with fertile phenotypes. We identify several expression modules, or groups of coexpressed genes, that are disrupted in subfertile hybrids, including modules functionally enriched for spermatogenesis, cilium and sperm flagellum organization, chromosome organization, and DNA repair, and including genes expressed in spermatogonia, spermatocytes, and spermatids. Our network-based approach enabled us to hone in on specific hub genes likely to be influencing module-wide gene expression and hence potentially driving large-effect DM incompatibilities. A disproportionate number of hub genes lie within sterility loci identified previously in the hybrid zone mapping population and represent promising candidate barrier genes and targets for future functional analysis.
Collapse
Affiliation(s)
- Katy Morgan
- Milner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom
| | - Bettina Harr
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Plön, Germany
| | | | - Bret A Payseur
- Laboratory of Genetics, University of Wisconsin, Madison, WI
| | - Leslie M Turner
- Milner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom
| |
Collapse
|
16
|
Mukaj A, Piálek J, Fotopulosova V, Morgan AP, Odenthal-Hesse L, Parvanov ED, Forejt J. Prdm9 Intersubspecific Interactions in Hybrid Male Sterility of House Mouse. Mol Biol Evol 2020; 37:3423-3438. [PMID: 32642764 PMCID: PMC7743643 DOI: 10.1093/molbev/msaa167] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/11/2020] [Accepted: 07/01/2020] [Indexed: 12/12/2022] Open
Abstract
The classical definition posits hybrid sterility as a phenomenon when two parental taxa each of which is fertile produce a hybrid that is sterile. The first hybrid sterility gene in vertebrates, Prdm9, coding for a histone methyltransferase, was identified in crosses between two laboratory mouse strains derived from Mus mus musculus and M. m. domesticus subspecies. The unique function of PRDM9 protein in the initiation of meiotic recombination led to the discovery of the basic molecular mechanism of hybrid sterility in laboratory crosses. However, the role of this protein as a component of reproductive barrier outside the laboratory model remained unclear. Here, we show that the Prdm9 allelic incompatibilities represent the primary cause of reduced fertility in intersubspecific hybrids between M. m. musculus and M. m. domesticus including 16 musculus and domesticus wild-derived strains. Disruption of fertility phenotypes correlated with the rate of failure of synapsis between homologous chromosomes in meiosis I and with early meiotic arrest. All phenotypes were restored to normal when the domesticus Prdm9dom2 allele was substituted with the Prdm9dom2H humanized variant. To conclude, our data show for the first time the male infertility of wild-derived musculus and domesticus subspecies F1 hybrids controlled by Prdm9 as the major hybrid sterility gene. The impairment of fertility surrogates, testes weight and sperm count, correlated with increasing difficulties of meiotic synapsis of homologous chromosomes and with meiotic arrest, which we suppose reflect the increasing asymmetry of PRDM9-dependent DNA double-strand breaks.
Collapse
Affiliation(s)
- Amisa Mukaj
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics of the Czech Academy of Science, Vestec, Czech Republic
| | - Jaroslav Piálek
- Research Facility Studenec, Institute of Vertebrate Biology of the Czech Academy of Sciences, Brno, Czech Republic
| | - Vladana Fotopulosova
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics of the Czech Academy of Science, Vestec, Czech Republic
| | | | - Linda Odenthal-Hesse
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Ploen, Germany
| | - Emil D Parvanov
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics of the Czech Academy of Science, Vestec, Czech Republic
| | - Jiri Forejt
- Department of Mouse Molecular Genetics, Institute of Molecular Genetics of the Czech Academy of Science, Vestec, Czech Republic
| |
Collapse
|
17
|
Widmayer SJ, Handel MA, Aylor DL. Age and Genetic Background Modify Hybrid Male Sterility in House Mice. Genetics 2020; 216:585-597. [PMID: 32817010 PMCID: PMC7536842 DOI: 10.1534/genetics.120.303474] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 08/11/2020] [Indexed: 12/15/2022] Open
Abstract
Hybrid male sterility (HMS) contributes to reproductive isolation commonly observed among house mouse (Mus musculus) subspecies, both in the wild and in laboratory crosses. Incompatibilities involving specific Prdm9 alleles and certain Chromosome (Chr) X genotypes are known determinants of fertility and HMS, and previous work in the field has demonstrated that genetic background modifies these two major loci. We constructed hybrids that have identical genotypes at Prdm9 and identical X chromosomes, but differ widely across the rest of the genome. In each case, we crossed female PWK/PhJ mice representative of the M. m. musculus subspecies to males from a classical inbred strain representative of M. m. domesticus: 129S1/SvImJ, A/J, C57BL/6J, or DBA/2J. We detected three distinct trajectories of fertility among the hybrids using breeding experiments. The PWK129S1 males were always infertile. PWKDBA2 males were fertile, despite their genotypes at the major HMS loci. We also observed age-dependent changes in fertility parameters across multiple genetic backgrounds. The PWKB6 and PWKAJ males were always infertile before 12 weeks and after 35 weeks. However, some PWKB6 and PWKAJ males were transiently fertile between 12 and 35 weeks. This observation could resolve previous contradictory reports about the fertility of PWKB6. Taken together, these results point to multiple segregating HMS modifier alleles, some of which have age-related modes of action. The ultimate identification of these alleles and their age-related mechanisms will advance understanding both of the genetic architecture of HMS and of how reproductive barriers are maintained between house mouse subspecies.
Collapse
Affiliation(s)
- Samuel J Widmayer
- Department of Biological Science, W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, North Carolina 27695
- Graduate Program in Genetics, North Carolina State University, Raleigh, North Carolina 27695
| | | | - David L Aylor
- Department of Biological Science, W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, North Carolina 27695
- Bioinformatics Research Center, Center for Human Health and the Environment, North Carolina State University, Raleigh, North Carolina 27695
- Comparative Medicine Institute, North Carolina State University, Raleigh, North Carolina 27695
| |
Collapse
|
18
|
Kanippayoor RL, Alpern JHM, Moehring AJ. A common suite of cellular abnormalities and spermatogenetic errors in sterile hybrid males in Drosophila. Proc Biol Sci 2020; 287:20192291. [PMID: 31964309 PMCID: PMC7015338 DOI: 10.1098/rspb.2019.2291] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 12/30/2019] [Indexed: 01/18/2023] Open
Abstract
When two species interbreed, the resulting hybrid offspring are often sterile, with the heterogametic (e.g. XY) hybrid usually being more severely affected. The prevailing theory for this pattern of sterility evokes divergent changes in separate lineages having maladaptive interactions when placed together in a hybrid individual, with recessive factors on the sex chromosome interacting with dominant factors on the autosomes. The effect of these interactions on gametogenesis should not be uniform across species pairs unless genetic divergence follows the same paths in different lineages or if a specific stage of gametogenesis is more susceptible to detrimental genetic interactions. Here, we perform a detailed cellular characterization of hybrid male sterility across three recently diverged species pairs of Drosophila. Across all three pairs, sterile hybrid sperm are alive but exhibit rapid nuclear de-condensation with age, with active, but non-differentiated, mitochondria. Surprisingly, all three sets of interspecies hybrids produce half of the number of sperm per round of spermatogenesis, with each sperm cell containing two tails. We identify non-disjunction failures during meiosis I as the likely cause. Thus, errors during meiosis I may be a general phenomenon underlying Drosophila male sterility, indicating either a heightened sensitivity of this spermatogenic stage to failure, or a basis to sterility other than the prevailing model.
Collapse
|
19
|
Liang J, Sharakhov IV. Premeiotic and meiotic failures lead to hybrid male sterility in the Anopheles gambiae complex. Proc Biol Sci 2019; 286:20191080. [PMID: 31288705 DOI: 10.1098/rspb.2019.1080] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Hybrid male sterility (HMS) contributes to speciation by restricting gene flow between related taxa. Detailed cytological characterization of reproductive organs in hybrid males is important for identifying phenotypes that can help guide searches of speciation genes. To investigate possible cellular causes of HMS, we performed crosses between closely related species of the Anopheles gambiae complex: An. merus with An. gambiae or An. coluzzii. We demonstrate that HMS in African malaria mosquitoes involves two defects in the reciprocal crosses: a premeiotic arrest of germline stem cells in degenerate testes and a failure of the reductional meiotic division of primary spermatocytes in normal-like testes. The premeiotic arrest in degenerate testes of hybrids is accompanied by a strong suppression of meiotic and postmeiotic genes. Unlike pure species, sex chromosomes in normal-like testes of F1 hybrids are largely unpaired during meiotic prophase I and all chromosomes show various degrees of insufficient condensation. Instead of entering reductional division in meiosis I, primary spermatocytes prematurely undergo an equational mitotic division producing non-motile diploid sperm. Thus, our study identified cytogenetic errors in interspecies hybrids that arise during the early stages of postzygotic isolation.
Collapse
Affiliation(s)
- Jiangtao Liang
- 1 Department of Entomology, Virginia Polytechnic Institute and State University , Blacksburg, VA , USA
| | - Igor V Sharakhov
- 1 Department of Entomology, Virginia Polytechnic Institute and State University , Blacksburg, VA , USA.,2 Department of Cytology and Genetics, Tomsk State University , Tomsk , Russian Federation
| |
Collapse
|